Abstract: In this paper, the Nanchang Honggu tunnel section of the pipe floating near the bridge pier, through the Nanchang Bridge 17#, 18# pier in the impact by the floating pipe, calculate the internal force generated at the most dangerous cross section of the pier. According to the "Code for Design of Highway Reinforced Concrete and Prestressed Concrete-Bridges and Culverts" to calculate the pier can withstand the maximum level of impact force. Using the finite element software ANSYS/LS-DYNA, considering the influence of impact angle and the water level, the impact force of the floating pipe hit the pier was analyzed and the anti-collision ability of the pier was evaluated according to the simulation results. Based on the characteristics of the waters of the bridge and the anti-collision ability of the pier, the flexible composite anti-collision facilities are designed. The numerical simulation results show that the horizontal impact force of the pier is obviously reduced after installation the composite anti-collision system, effectively protect the safe use of the pier structure and avoids collision damage from the floating pipe section.

Key words: pipe-bridge collision, composite, pier resistance, anti-collision system, numerical simulation